Improvement in door and alarm bells



J. G. WIGGIN'SQ noon AND ALARM BELL. 193,903.

Patented Aug. 7,1877.

ATTORNEYS.

JEFFERSON G. WIGGINS, OF SENECA FALLS, NEW YORK.

IMPROVEMENT IN DOOR AND ALARM BELLS.

Specification forming part of Letters Patent No. 193,903, dated August 7, 1877 application filed June 25, 1877.

door, or it may be sounded from the outside of the door without turning the knob, as will be understood from the following description.

In the annexed drawings, Figure 1 is a vertical section taken centrally through the alarm mechanism and door-latch applied to a door. Figs. 2, 3, and et'are details.

Similar letters of reference indicate corresponding parts.

The letter A designates a section of a door,

- and B the case of a door-latch of well-known construction, which is operated by a spindle, 0, bearing two knobs, D D.

Part of the spindleG is tubular, and receives in it a rod, a, which has secured to its outer end a push-button, E, which is free to play in a recess formed in the outside knob D, and is held in the position shown in Fig. 1 by a helical spring, b. The inner end of this rod b terminates in an enlargement which is in close relation to a curved tripping-dog, 0, so that by pressing in the push-button E this dog will be moved about a fulcrum, e, and cause one of two hammers F to strike a bell, l1", and sound an alarm. A portion of the spindle O is cut away to allow the free end of the dog 0 to play freely.

G designates a tubular bracket, which is rigidly secured to the inside of the door, and which receives freely through it the spindle O. This bracket has pivoted to it at ff two segment-shaped blocks, H H, which have the hammer-rods fixed to them, and which are held together by means of a spring, S, fixed on top of them.

One of the 'iner-hlocks H has a short arm, 9, extendi g from its rear side, which is struck by the tripping-dog c, and the said block vibrated, causing a hammer to strike the bell.

If it is desired to sound an alarm by turning either one of the knobs D D the following devices are employed The reduced cylindrical portion of the bracket G is slotted transversely and longitudinally, and receives a tripping T-head, h, whichis secured to a screwthreaded tube, k, that is endwise adjustable in the end of the bracket by means of a milled nut, J. The tube It is applied on the spindle 0, so as to turn with it, and thus allow the T-head h to be oscillate K K are two segments, which are pivoted to the blocks H H, and provided with stoppinsi t', that play in curved slots in these blocks. These segments are acted on by the T-head h when it is oscillated, each segment receding to allow the dog to assume the position shown in Fig.2.

it will be observed that when either knob is turned to the right or left, the T-head h, acting on the lower edge of a segment, K, will cause an alarm to be sounded.

If it is not desired to sound an alarm by turning the knobs D D, the T-head h is ad justed out of reach of the segment K K by turning the milled nut.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In combination with alarm mechanism, the button-head rod b, applied in the spindle O, the dog 0, and one or two segments H, bearing hammers, substantially as described.

2. Dog 0, applied to the latch-spindle O, and

pivoted to the bracket G, in combination with alarm mechanism, substantially in the manner described.

3. Pivoted segments K K, combined with segments H H, spring S, and adjustable T-head h, substantially as described.

4. The T-head h, formed on an endwise adjustable tube, It, in combination with slotted bracket G, spindle O, and adjustingnut J, substantially in the manner and for the purpose described.

JEFFERSON G. WIGG'INS.

Witnesses! I JASPER N. HAMMOND, A. W. HAMMETT. 

